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/*!
* jQuery UI Touch Punch 0.2.2
*
* Copyright 2011, Dave Furfero
* Dual licensed under the MIT or GPL Version 2 licenses.
*
* Depends:
* jquery.ui.widget.js
* jquery.ui.mouse.js
*/
(function ($) {
// Detect touch support
$.support.touch = 'ontouchend' in document;
// Ignore browsers without touch support
if (!$.support.touch) {
return;
}
var mouseProto = $.ui.mouse.prototype,
_mouseInit = mouseProto._mouseInit,
touchHandled;
/**
* Simulate a mouse event based on a corresponding touch event
* @param {Object} event A touch event
* @param {String} simulatedType The corresponding mouse event
*/
function simulateMouseEvent (event, simulatedType) {
// Ignore multi-touch events
if (event.originalEvent.touches.length > 1) {
return;
}
event.preventDefault();
var touch = event.originalEvent.changedTouches[0],
simulatedEvent = document.createEvent('MouseEvents');
// Initialize the simulated mouse event using the touch event's coordinates
simulatedEvent.initMouseEvent(
simulatedType, // type
true, // bubbles
true, // cancelable
window, // view
1, // detail
touch.screenX, // screenX
touch.screenY, // screenY
touch.clientX, // clientX
touch.clientY, // clientY
false, // ctrlKey
false, // altKey
false, // shiftKey
false, // metaKey
0, // button
null // relatedTarget
);
// Dispatch the simulated event to the target element
event.target.dispatchEvent(simulatedEvent);
}
/**
* Handle the jQuery UI widget's touchstart events
* @param {Object} event The widget element's touchstart event
*/
mouseProto._touchStart = function (event) {
var self = this;
// Ignore the event if another widget is already being handled
if (touchHandled || !self._mouseCapture(event.originalEvent.changedTouches[0])) {
return;
}
// Set the flag to prevent other widgets from inheriting the touch event
touchHandled = true;
// Track movement to determine if interaction was a click
self._touchMoved = false;
// Simulate the mouseover event
simulateMouseEvent(event, 'mouseover');
// Simulate the mousemove event
simulateMouseEvent(event, 'mousemove');
// Simulate the mousedown event
simulateMouseEvent(event, 'mousedown');
};
/**
* Handle the jQuery UI widget's touchmove events
* @param {Object} event The document's touchmove event
*/
mouseProto._touchMove = function (event) {
// Ignore event if not handled
if (!touchHandled) {
return;
}
// Interaction was not a click
this._touchMoved = true;
// Simulate the mousemove event
simulateMouseEvent(event, 'mousemove');
};
/**
* Handle the jQuery UI widget's touchend events
* @param {Object} event The document's touchend event
*/
mouseProto._touchEnd = function (event) {
// Ignore event if not handled
if (!touchHandled) {
return;
}
// Simulate the mouseup event
simulateMouseEvent(event, 'mouseup');
// Simulate the mouseout event
simulateMouseEvent(event, 'mouseout');
// If the touch interaction did not move, it should trigger a click
if (!this._touchMoved) {
// Simulate the click event
simulateMouseEvent(event, 'click');
}
// Unset the flag to allow other widgets to inherit the touch event
touchHandled = false;
};
/**
* A duck punch of the $.ui.mouse _mouseInit method to support touch events.
* This method extends the widget with bound touch event handlers that
* translate touch events to mouse events and pass them to the widget's
* original mouse event handling methods.
*/
mouseProto._mouseInit = function () {
var self = this;
// Delegate the touch handlers to the widget's element
self.element
.bind('touchstart', $.proxy(self, '_touchStart'))
.bind('touchmove', $.proxy(self, '_touchMove'))
.bind('touchend', $.proxy(self, '_touchEnd'));
// Call the original $.ui.mouse init method
_mouseInit.call(self);
};
})(jQuery);
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